NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

NOTE 1 – ACCOUNTING POLICIES AND BASIS OF PRESENTATION

Basis of Presentation

The accounting and financial reporting policies of Atlantic Capital Bancshares, Inc. (“Atlantic Capital” or the “Company”) and its subsidiary conform to accounting principles generally accepted in the United States of America (“GAAP”) and general banking industry practices. The accompanying interim consolidated financial statements have not been audited. All material intercompany balances and transactions have been eliminated.

In management’s opinion, all accounting adjustments necessary to accurately reflect the financial position and results of operations on the accompanying financial statements have been made. These adjustments are normal and recurring accruals considered necessary for a fair and accurate presentation. The accompanying consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in Atlantic Capital’s filing on Form 10-K. The results for interim periods are not necessarily indicative of results for the full year or any other interim periods. Certain prior period amounts have been reclassified to conform to the current year presentation.

NOTE 2 – ACCOUNTING STANDARDS UPDATES AND RECENTLY ADOPTED STANDARDS

In August 2017, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2017-12 - “ Derivatives and Hedging: Targeted Improvements to Accounting for Hedging Activities .” The purpose of this updated guidance is to better align a company’s financial reporting for hedging activities with the economic objectives of those activities. ASU 2017-12 is effective for public business entities for fiscal years beginning after December 15, 2018, with early adoption, including adoption in an interim period, permitted. Atlantic Capital plans to adopt ASU 2017-12 on January 1, 2018. The guidance requires a modified retrospective transition method resulting in the cumulative effect of the change on the opening balance of each affected component of equity in the statement of financial position as of the date of adoption. Atlantic Capital does not expect adoption to have a material impact on its consolidated financial statements.

In May 2017, the FASB issued ASU 2017-09 - “ Compensation - Stock Compensation (Topic 718): Scope and Modification Accounting .” The amendments in this ASU provide guidance about which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting in accordance with Topic 718. The amendments will be effective for interim and annual reporting periods beginning after December 15, 2017. This ASU is not expected to have a material impact on Atlantic Capital’s consolidated financial statements.

In March 2017, the FASB issued ASU 2017-08 “ Receivables - Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities .” This guidance shortens the premium amortization period for certain callable debt securities by requiring amortization to the earliest call date. The standard is effective for public companies for annual and interim periods beginning after December 15, 2020. The adoption of this update is not expected to have a material impact on Atlantic Capital’s consolidated financial statements.

In January 2017, the FASB issued ASU 2017-04, “ Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment ,” which intends to simplify goodwill impairment testing by eliminating the second step of the analysis under which the implied fair value of goodwill is determined as if the reporting unit were being acquired in a business combination. The update instead requires entities to compare the fair value of a reporting unit with its carrying amount and recognize an impairment charge for any amount by which the carrying amount exceeds the reporting unit’s fair value, to the extent that the loss recognized does not exceed the amount of goodwill allocated to that reporting unit. ASU 2017-04 must be applied prospectively and is effective for the Company on January 1, 2020. Early adoption is permitted. Atlantic Capital does not expect the new guidance to have a material impact on its financial condition or results of operation.

In August 2016, the FASB issued ASU 2016-15, “ Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments ,” to address diversity in how certain cash receipts and cash payments are presented and classified in the statement of cash flows. The amendments provide guidance on the following eight specific cash flow issues: 1) debt prepayment or debt extinguishment costs; 2) settlement of zero-coupon debt instruments or other debt instruments with coupon interest rates that are insignificant in relation to the effective interest rate of the borrowing; 3) contingent consideration payments made after a business combination; 4) proceeds from the settlement of insurance claims; 5) proceeds from the settlement of corporate-owned life insurance policies, including bank-owned life insurance policies; 6) distributions received from equity method investees; 7) beneficial interests in securitization transactions; and 8) separately identifiable cash flows and application of the predominance principle. The amendments are effective for public companies for fiscal years beginning after December 31, 2017, and interim periods within those fiscal years. Early adoption is permitted, including adoption in an interim period. As this guidance only affects

the classification within the statement of cash flows, this ASU is not expected to have a material impact on the Company’s consolidated financial statements.

In June 2016, the FASB issued ASU 2016-13 “ Financial Instruments - Credit Losses (Topic 326) Measurement of Credit Losses on Financial Instruments. ” ASU 2016-13 requires an entity to utilize a new impairment model known as the current expected credit loss (“CECL”) model to estimate its lifetime “expected credit loss” and record an allowance that, when deducted from the amortized cost basis of the financial asset, presents the net amount expected to be collected on the financial asset. The CECL model is expected to result in more timely recognition of credit losses. ASU 2016-13 also requires new disclosures for financial assets measured at amortized cost, loans and available-for-sale debt securities. ASU 2016-13 is effective for public companies for annual periods beginning after December 13, 2019, including interim periods within those fiscal years. Entities will apply the standard’s provisions as a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is adopted. Atlantic Capital is in the process of evaluating the impact of the adoption of ASU 2016-13 on the Company’s consolidated financial statements and disclosures.

In March 2016, the FASB issued ASU 2016-09, “ Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting .” The amendments in ASU 2016-09 simplify several aspects of accounting for employee share-based payments including income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. Some areas of the simplification apply only to nonpublic entities. The new guidance will require all income tax effects of awards to be recognized as income tax expense or benefit in the income statement when the awards vest or are settled and additional paid in capital pools will be eliminated. The guidance requires companies to present excess tax benefits as an operating activity on the statement of cash flows rather than as a financing activity. Companies will be required to account for forfeitures of share-based payments by recognizing forfeitures of awards as they occur or estimating the number of awards expected to be forfeited and adjusting the estimate when it is likely to change, as currently required, through an accounting policy election. The guidance will increase the amount an employer can withhold to cover income taxes on awards and still qualify for the exception to liability classification for shares used to satisfy the employer’s income tax withholding obligation. The guidance requires an employer to classify the cash paid to a tax authority when shares are withheld to satisfy its statutory income tax withholding obligation as a financing activity on the statement of cash flows. ASU 2016-09 became effective for the Company on January 1, 2017 and did not have a material effect on its financial position or results of operations.

In February 2016, the FASB issued ASU 2016-2, Leases . Under the new guidance, leases classified as operating leases under previous GAAP must be recorded on the balance sheet. A lessee should recognize in the statement of financial position a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term. The standard is effective for public companies for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. Early adoption is permitted. The new standard must be adopted using a modified retrospective transition, and provides for certain practical expedients. Atlantic Capital is evaluating the significance and other effects of adoption on the consolidated financial statements and related disclosures.

In January 2016, the FASB issued ASU 2016-1, “ Financial Instruments – Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Liabilities .” The guidance in this update requires that equity investments (except those accounting for under the equity method of accounting) be measured at fair value with changes in fair value recognized in net income. However, an entity may choose to measure equity investments that do not have readily determinable fair values at cost minus impairment, if any, plus or minus changes resulting from observable price changes in orderly transactions for the identical or a similar investment of the same issuer. The guidance also simplifies the impairment assessment of equity investments without readily determinable fair values by requiring a qualitative assessment to identify impairment. In addition, the guidance addresses various disclosure and presentation issues related to financial instruments. For public entities, this update is effective for fiscal years beginning after December 15, 2017 with early application permitted. The adoption of this update is not expected to have a material impact on Atlantic Capital’s consolidated financial statements.

In May 2014, the FASB issued ASU 2014-09, “ Revenue from Contracts with Customers .” This update is a joint project with the International Accounting Standards Board initiated to clarify the principles for recognizing revenue and to develop a common revenue standard that is meant to remove inconsistencies and weaknesses in revenue requirements, provide a more robust framework for addressing revenue issues, improve comparability of revenue recognition practices, provide more useful information to users of financial statements and simplify the preparation of financial statements. The core principle of the guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. For public companies, this guidance is effective for annual and interim periods beginning after December 15, 2017. Because the guidance does not apply to revenue associated with financial instruments, including loans and securities, this ASU will not have a material impact on net interest income and securities gains. Atlantic Capital completed an initial evaluation of the impact to other revenue streams such as service charges and trust income, and believes the most significant changes will be related to disclosures.

NOTE 3 – ACQUISITIONS AND DIVESTITURES

On October 31, 2015, Atlantic Capital completed the acquisition of First Security Group, Inc. (“First Security”). First Security operated twenty-five branches in Georgia and Tennessee. In connection with the acquisition, Atlantic Capital acquired approximately $801.1 million of loans and assumed approximately $970.0 million of deposits.

Acquisition-related costs totaled $0 and $304,000 for the three and nine months ended September 30, 2017, respectively, and $579,000 and $2.5 million for the three and nine months ended September 30, 2016, respectively, and were included in noninterest expense in the consolidated income statement. Acquisition related costs primarily include severance costs, professional services, data processing fees related to systems conversion and other noninterest expenses.

Divestiture of Branches

On December 17, 2015, Atlantic Capital Bank, N.A. (the “Bank”) entered into two separate definitive agreements to sell seven branches in the Tennessee market. The agreement with First Freedom Bank included the sale of three branches located in Algood, Cookeville and Gainesboro, Tennessee for a premium of 2.25% of deposits. The agreement with Athens Federal Community Bank, N.A. included the sale of four branches in Athens, Lenoir City, Madisonville and Sweetwater, Tennessee for a premium of 3.50% of deposits. Both transactions closed in the second quarter of 2016 and resulted in a combined gain of $3.9 million as well as a reduction of approximately $191.0 million in deposits, approximately $34.7 million in loans and approximately $8.6 million in other assets. The gain was somewhat reduced by an impairment of $2.0 million in core deposit intangibles, which was offset by a $344,000 reversal in time deposit premium. There were also $305,000 of expenses associated with the divestitures included in noninterest expense in the second quarter of 2016.

On December 9, 2016, Atlantic Capital entered into a definitive agreement to sell one branch in Cleveland, Tennessee, to SmartBank. The sale closed in the second quarter of 2017, and resulted in a net gain of $302,000 as well as a reduction of approximately $21.9 million in deposits and approximately $27.3 million in loans and other assets. The gross gain of $533,000 was reduced by an impairment of $337,000 in core deposit intangibles, which was offset by a $106,000 reversal in time deposit premium. There were also $38,000 of expenses associated with the divestiture included in noninterest expense in the second quarter of 2017.

NOTE 4 – BALANCE SHEET OFFSETTING

Atlantic Capital enters into reverse repurchase agreements in order to invest short-term funds. Atlantic Capital enters into repurchase agreements for short-term financing needs.

The following table presents a summary of amounts outstanding under reverse repurchase agreements, repurchase agreements, and derivative financial instruments including those entered into in connection with the same counterparty under master netting agreements as of September 30, 2017 and December 31, 2016 . While these agreements are typically over-collateralized, U.S. GAAP requires disclosures in this table to limit the amount of such collateral to the amount of the related recognized asset or liability for each counterparty.